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Finding the Fourth Proportional to 613.12, 919.96 and 561.21

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Solution

The fourth proportional to 613.12, 919.96 and 561.21 is: 842.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.12 : 919.96 = 561.21 : x
  2. Step 2: Convert to fraction form
    613.12/919.96 = 561.21/x
  3. Step 3: Cross multiply
    613.12x = 919.96 × 561.21
  4. Step 4: Simplify right side
    613.12x = 516,289.13
  5. Step 5: Solve for x
    x = 516,289.13/613.12
  6. Step 6: Final answer
    x = 842.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.